package dos

import (
	"context"
	"math/rand"
	"strings"
	"time"
)

// DOSAttackStrategy 攻击策略接口
type DOSAttackStrategy interface {
	// Execute 执行攻击策略
	Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error
	// GetName 获取攻击名称
	GetName() string
	// GetEffectiveness 获取攻击效果评分
	GetEffectiveness() float64
}

// BaseAttackStrategy 基础攻击策略
type BaseAttackStrategy struct {
	name                string
	description         string
	effectiveness       float64
	resourceConsumption float64
	successCount        int64
	failCount           int64
	isRunning           bool
	stopChan            chan struct{}
	obfuscationEnabled  bool
	stealthCompatible   bool
	wafBypassSupport    bool
}

// NewBaseAttackStrategy 创建基础攻击策略
func NewBaseAttackStrategy(name, description string, stealthCompatible, wafBypassSupport bool) *BaseAttackStrategy {
	return &BaseAttackStrategy{
		name:              name,
		description:       description,
		stopChan:          make(chan struct{}),
		stealthCompatible: stealthCompatible,
		wafBypassSupport:  wafBypassSupport,
	}
}

// GetName 获取攻击名称
func (s *BaseAttackStrategy) GetName() string {
	return s.name
}

// GetDescription 获取攻击描述
func (s *BaseAttackStrategy) GetDescription() string {
	return s.description
}

// GetEffectiveness 获取攻击效果评分
func (s *BaseAttackStrategy) GetEffectiveness(target *TargetInfo) float64 {
	return s.effectiveness
}

// GetResourceConsumption 获取资源消耗评分
func (s *BaseAttackStrategy) GetResourceConsumption() float64 {
	return s.resourceConsumption
}

// IsStealthCompatible 是否兼容隐蔽模式
func (s *BaseAttackStrategy) IsStealthCompatible() bool {
	return s.stealthCompatible
}

// SupportsWAFBypass 是否支持WAF绕过
func (s *BaseAttackStrategy) SupportsWAFBypass() bool {
	return s.wafBypassSupport
}

// Stop 停止攻击
func (s *BaseAttackStrategy) Stop() {
	if s.isRunning {
		close(s.stopChan)
		s.isRunning = false
	}
}

// TCPFloodStrategy TCP洪水攻击策略
type TCPFloodStrategy struct {
	*BaseAttackStrategy
}

// NewTCPFloodStrategy 创建TCP洪水攻击策略
func NewTCPFloodStrategy() *TCPFloodStrategy {
	return &TCPFloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"TCP Flood",
			"通过创建大量TCP连接消耗目标服务器资源",
			false, // 不兼容隐蔽模式
			false, // 不支持WAF绕过
		),
	}
}

// Execute 执行TCP洪水攻击
func (s *TCPFloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现TCP洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取TCP洪水攻击对特定目标的有效性评分
func (s *TCPFloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// 根据目标信息计算有效性评分
	// 如果目标是Web服务器，TCP洪水攻击有效性较低
	if target.webServer != "" {
		return 0.4
	}
	// 如果目标有防火墙保护，有效性降低
	if strings.Contains(strings.ToLower(target.protectionType), "firewall") {
		return 0.3
	}
	// 默认有效性
	return 0.7
}

// HTTPFloodStrategy HTTP洪水攻击策略
type HTTPFloodStrategy struct {
	*BaseAttackStrategy
}

// NewHTTPFloodStrategy 创建HTTP洪水攻击策略
func NewHTTPFloodStrategy() *HTTPFloodStrategy {
	return &HTTPFloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"HTTP Flood",
			"通过发送大量HTTP请求消耗Web服务器资源",
			true, // 兼容隐蔽模式
			true, // 支持WAF绕过
		),
	}
}

// Execute 执行HTTP洪水攻击
func (s *HTTPFloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现HTTP洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取HTTP洪水攻击对特定目标的有效性评分
func (s *HTTPFloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// 根据目标信息计算有效性评分
	// 如果目标是Web服务器，HTTP洪水攻击有效性较高
	if target.webServer != "" {
		return 0.8
	}
	// 如果目标有WAF保护，有效性降低
	if target.wafInfo != nil && target.wafInfo.detected {
		return 0.5
	}
	// 默认有效性
	return 0.6
}

// SYNFloodStrategy SYN洪水攻击策略
type SYNFloodStrategy struct {
	*BaseAttackStrategy
}

// NewSYNFloodStrategy 创建SYN洪水攻击策略
func NewSYNFloodStrategy() *SYNFloodStrategy {
	return &SYNFloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"SYN Flood",
			"通过发送大量SYN包而不完成三次握手来消耗服务器连接资源",
			false, // 不兼容隐蔽模式
			false, // 不支持WAF绕过
		),
	}
}

// Execute 执行SYN洪水攻击
func (s *SYNFloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现SYN洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取SYN洪水攻击对特定目标的有效性评分
func (s *SYNFloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// SYN洪水攻击在大多数情况下都很有效
	return 0.85
}

// UDPFloodStrategy UDP洪水攻击策略
type UDPFloodStrategy struct {
	*BaseAttackStrategy
}

// NewUDPFloodStrategy 创建UDP洪水攻击策略
func NewUDPFloodStrategy() *UDPFloodStrategy {
	return &UDPFloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"UDP Flood",
			"通过发送大量UDP数据包消耗目标带宽",
			false, // 不兼容隐蔽模式
			false, // 不支持WAF绕过
		),
	}
}

// Execute 执行UDP洪水攻击
func (s *UDPFloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现UDP洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取UDP洪水攻击对特定目标的有效性评分
func (s *UDPFloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// UDP洪水攻击在带宽有限的目标上效果更好
	if target.bandwidthLimit > 0 && target.bandwidthLimit < 1000000000 { // 小于1Gbps
		return 0.9
	}
	return 0.7
}

// SlowlorisStrategy Slowloris攻击策略
type SlowlorisStrategy struct {
	*BaseAttackStrategy
}

// NewSlowlorisStrategy 创建Slowloris攻击策略
func NewSlowlorisStrategy() *SlowlorisStrategy {
	return &SlowlorisStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"Slowloris",
			"通过缓慢发送HTTP请求头消耗Web服务器连接资源",
			true, // 兼容隐蔽模式
			true, // 支持WAF绕过
		),
	}
}

// Execute 执行Slowloris攻击
func (s *SlowlorisStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现Slowloris攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取Slowloris攻击对特定目标的有效性评分
func (s *SlowlorisStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// Slowloris对Apache等服务器特别有效
	if strings.Contains(strings.ToLower(target.webServer), "apache") {
		return 0.95
	}
	// 对其他Web服务器也有一定效果
	if target.webServer != "" {
		return 0.7
	}
	return 0.3
}

// HTTP2FloodStrategy HTTP/2洪水攻击策略
type HTTP2FloodStrategy struct {
	*BaseAttackStrategy
}

// NewHTTP2FloodStrategy 创建HTTP/2洪水攻击策略
func NewHTTP2FloodStrategy() *HTTP2FloodStrategy {
	return &HTTP2FloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"HTTP/2 Flood",
			"利用HTTP/2协议特性发起的洪水攻击",
			true, // 兼容隐蔽模式
			true, // 支持WAF绕过
		),
	}
}

// Execute 执行HTTP/2洪水攻击
func (s *HTTP2FloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现HTTP/2洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取HTTP/2洪水攻击对特定目标的有效性评分
func (s *HTTP2FloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// HTTP/2攻击对支持HTTP/2的服务器更有效
	if target.webServer != "" {
		return 0.75
	}
	return 0.4
}

// ConnectionFloodStrategy 连接洪水攻击策略
type ConnectionFloodStrategy struct {
	*BaseAttackStrategy
}

// NewConnectionFloodStrategy 创建连接洪水攻击策略
func NewConnectionFloodStrategy() *ConnectionFloodStrategy {
	return &ConnectionFloodStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"Connection Flood",
			"建立大量连接并保持打开状态以消耗服务器资源",
			false, // 不兼容隐蔽模式
			false, // 不支持WAF绕过
		),
	}
}

// Execute 执行连接洪水攻击
func (s *ConnectionFloodStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现连接洪水攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取连接洪水攻击对特定目标的有效性评分
func (s *ConnectionFloodStrategy) GetEffectiveness(target *TargetInfo) float64 {
	return 0.75
}

// SSLExhaustionStrategy SSL资源耗尽攻击策略
type SSLExhaustionStrategy struct {
	*BaseAttackStrategy
}

// NewSSLExhaustionStrategy 创建SSL资源耗尽攻击策略
func NewSSLExhaustionStrategy() *SSLExhaustionStrategy {
	return &SSLExhaustionStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"SSL Exhaustion",
			"通过创建大量SSL/TLS连接消耗服务器CPU资源",
			false, // 不兼容隐蔽模式
			true,  // 支持WAF绕过
		),
	}
}

// Execute 执行SSL资源耗尽攻击
func (s *SSLExhaustionStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现SSL资源耗尽攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取SSL资源耗尽攻击对特定目标的有效性评分
func (s *SSLExhaustionStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// 对HTTPS网站特别有效
	if strings.HasPrefix(target.url, "https://") {
		return 0.9
	}
	return 0.3
}

// DNSAmplificationStrategy DNS放大攻击策略
type DNSAmplificationStrategy struct {
	*BaseAttackStrategy
}

// NewDNSAmplificationStrategy 创建DNS放大攻击策略
func NewDNSAmplificationStrategy() *DNSAmplificationStrategy {
	return &DNSAmplificationStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"DNS Amplification",
			"利用DNS响应放大流量的攻击",
			false, // 不兼容隐蔽模式
			false, // 不支持WAF绕过
		),
	}
}

// Execute 执行DNS放大攻击
func (s *DNSAmplificationStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现DNS放大攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取DNS放大攻击对特定目标的有效性评分
func (s *DNSAmplificationStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// DNS放大攻击在大多数情况下都很有效
	return 0.85
}

// XMLBombStrategy XML炸弹攻击策略
type XMLBombStrategy struct {
	*BaseAttackStrategy
}

// NewXMLBombStrategy 创建XML炸弹攻击策略
func NewXMLBombStrategy() *XMLBombStrategy {
	return &XMLBombStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"XML Bomb",
			"利用XML实体扩展漏洞消耗服务器资源",
			true, // 兼容隐蔽模式
			true, // 支持WAF绕过
		),
	}
}

// Execute 执行XML炸弹攻击
func (s *XMLBombStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现XML炸弹攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取XML炸弹攻击对特定目标的有效性评分
func (s *XMLBombStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// 对处理XML的Web服务特别有效
	if target.webServer != "" && len(target.vulnerabilities) > 0 {
		for _, vuln := range target.vulnerabilities {
			if strings.Contains(strings.ToLower(vuln), "xml") {
				return 0.95
			}
		}
	}
	return 0.5
}

// RegexDOSStrategy 正则表达式DOS攻击策略
type RegexDOSStrategy struct {
	*BaseAttackStrategy
}

// NewRegexDOSStrategy 创建正则表达式DOS攻击策略
func NewRegexDOSStrategy() *RegexDOSStrategy {
	return &RegexDOSStrategy{
		BaseAttackStrategy: NewBaseAttackStrategy(
			"Regex DOS",
			"利用复杂正则表达式回溯导致的CPU资源耗尽",
			true, // 兼容隐蔽模式
			true, // 支持WAF绕过
		),
	}
}

// Execute 执行正则表达式DOS攻击
func (s *RegexDOSStrategy) Execute(ctx context.Context, target *TargetInfo, args map[string]interface{}) error {
	s.isRunning = true
	s.stopChan = make(chan struct{})

	// 实现正则表达式DOS攻击逻辑
	// ...

	return nil
}

// GetEffectiveness 获取正则表达式DOS攻击对特定目标的有效性评分
func (s *RegexDOSStrategy) GetEffectiveness(target *TargetInfo) float64 {
	// 对Web应用特别有效
	if target.webServer != "" {
		return 0.8
	}
	return 0.4
}

// 生成随机字符串(DOS攻击专用)
func generateRandomStringDOS(length int) string {
	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	seededRand := rand.New(rand.NewSource(time.Now().UnixNano()))

	b := make([]byte, length)
	for i := range b {
		b[i] = charset[seededRand.Intn(len(charset))]
	}
	return string(b)
}
